US Bridges

Capitol Blvd over I-5 Ramp

Poor

Thurston County, Washington · 0.7 N JCT US 101 · Structure no. 0005152A0000000

Built
1956
69 years old, rebuilt 1988
Condition
Poor
inspected October 2023
Type
Arch - Deck
Steel Continuous
Length
283 ft
4 main spans
Daily traffic
13,767
2020 count
Owner
State
State Highway Agency

About this bridge

Capitol Blvd over I-5 Ramp is a steel continuous arch - deck carrying Capitol Blvd over I-5 Ramp in Thurston County, Washington. It was built in 1956 and reconstructed in 1988, so it is 69 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 13,767 vehicles a day, roughly 5% of them trucks, projected to reach 23,456 by 2040. The structure is 283 ft (86.3 m) long and 71 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCapitol Blvd
CrossesI-5 Ramp
Location0.7 N JCT US 101
RouteCity Street 0
CountyThurston County
StateWashington
Coordinates47.02551, -122.89947
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45 US tons

Structure

Structure typeArch - Deck
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length283 ft (86.3 m)
Longest span184 ft (56.1 m)
Deck width71 ft (21.5 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,767 (2020)
Projected traffic23,456 by 2040
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$7.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Capitol Blvd over I-5 Ramp built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1988.

What condition is Capitol Blvd over I-5 Ramp in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.

How much traffic does Capitol Blvd over I-5 Ramp carry?

About 13,767 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Capitol Blvd over I-5 Ramp?

The structure is 283 ft (86.3 m) long with a longest span of 184 ft (56.1 m) and a deck 71 ft wide.

Who owns Capitol Blvd over I-5 Ramp?

It is owned by the State Highway Agency.